TEXTBOOK SOLUTIONS FOR

College Physics With an Integrated Approach to Forces and Kinematics 4th Edition

4188 step-by-step solutions

Solved by publishers, professors & experts

iOS, Android, & web

81% of students said using Chegg better prepared them for exams

2013 Chegg Homework Help Survey

PROBLEM

Chapter:Problem:

show all steps

Women often experience back pain when they are pregnant. Suppose a woman's mass before pregnancy is 68 kg and her center of mass when standing is located directly above the hips. By the thirty-fourth week of pregnancy, shehas gained8.0 kg (the combined mass of the fetus, the placenta, and the amniotic fluid).The center of mass of this 8.0 kg is 18cm in front of the hips. If she hasn't changed her posture, how far infront of the hips is her center of mass? [Women have three wedge-shaped lumbar vertebrae, whereas men have only two. This evolutionary adaptation permits a greater curvature of the lumbar spine to keep a pregnant woman's CM above the hips. See Nature450 (Dec 13;2007) pp. 1075–1078.]